Rivet.



W. P BARTEL.

BIVET. APPLICATION FILED 00114, 1908.

Patented Nov. 2, 1909.

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UNITED STATES ATENTOFFICE.

WILLIAM P. BARTEL, OF WALTHAIVI, MASSACHUSETTS, ASSIGNOR TO JUIDSON L.THOM- SON MFG. (30., A CORPORATION OF MAINE.

EIVET.

To all whom it may concern:

Be it known that I, lVILLIAM P. BARTEL, a citizen of the United States,residing at lValtham, in the county of Middlesex and State ofMassachusetts, have invented new and useful Improvements in Rivets, ofwhich the following is a specification.

The object of this invention is to provide a two-part rivet consisting,namely, of a head and a shank, the head being preferably hardened, andthe two parts being very firmly attached one to the other.

The rivet is intended to be used in automobile tires to prevent skiddingand in such use the wear upon the upper surface of the head is verygreat and the lateral strain which is brought to bear upon the head andstem, tending to work the head loose upon the stem, is also very great.It is, therefore, very desirable that the surface of the hardened metalforming the head of the rivet should be as large as possible, so thatthe rivet will wear for a long period. It is also very desirable thatthe stem portion of the rivet should be large, while that portion of theshank forming the head shall be as small as possible consistent with thenecessary strength, and in order to arrive at these re sults in thecompleted rivet I have formed and constructed the same as hereinafterdescribed.

The invention consists in a two-part rivet constructed as hereinafterdescribed and particularly as set forth in the claims.

Referring to the drawings: Figure 1 is a plan view of my improved rivetenlarged. Fig. 2 is a front elevation of the same. Fig. 3 is a sideelevation of the rivet shank, with the head of the rivet shown insection in position upon the rivet shank for the upper portion of thestem to be upset to form a head thereon. Fig. 4 is a central sectiontaken through line 4-4 of Fig. 1. Fig. 5 is a central section similar toFig. 4 illustrating a modified form of my invention.

Like numerals refer to like parts throughout the several views of thedrawings.

In the drawings Figs. 1 to i inclusive, 5 is the head of the rivetconsisting of a disk of metal which is preferably hardened and hastherein a conical hole 6 at the bottom of which is an annular flange 7The shank 8 consists of a conical top 9 and a stem 10. The conical top 9fits in the conical hole 6 in the head 5 and said conical top or head ofSpecification of Letters Patent.

Application filed October 14, 1908.

Patented Nov. 2, 1909.

Serial No. 457,646.

' the shank portion of the rivet terminates at its lower end in ashoulder 11 which rests upon the upper side of the flange 7.

The stem 10 has an annular flange 12 thereon which is locatedimmediately beneath and in contact with the annular flange 7 on the head5, whereby an annular groove 13 is provided between the shoulder 11 andthe flange 12, into which groove the annular flange 7 upon the head 5projects. It will be seen by observation that the diameter of the shankat the bottom of the groove 13 is substantially less than the diameterof the stem portion 10 of said shank, so that the sides of the conicalhead 9 of the shank may form a practical angle, and as the head 5 wearsaway, this conical head 9 will still hold the head 5 upon its shank.Moreover, the flange 12 forms a very strong locking means to prevent anyrocking of the head upon the shank of the rivet. It will thus be seenthat the head 5, together with the c0nical head 9, must both wear downto the shoulder 11 before the head 5 can become detached from the rivetshank 8.

By reducing the diameter of the upper portion 9 of the shank 8, asillustrated in Fig. 3, it will be seen that the conical top 9 of therivet shank does not take up much of the wearing surface of the head 5,so that by the construction hereinbefore described, we get not only astrong rivet, with the parts very rigidly united against either lateralor longitudinal strain, but the head portion of the rivet presents alarge wearing surface in proportion to the diameter of the stem portion10 of the shank of said rivet.

For the particular purpose hereinbefore set forth of a rivet forautomobile tires to prevent skidding, the conical formation of therecess 6 and the conical formation of the top of the shank which fitstherein is desirable, but in many cases it may not be necessary thatsuch conical formation should be employed, and in such cases the top 9of the shank could be cylindrical, but would still be shouldered at 11and the annular flange 7 would still project into the annular groove 13,whereby the shank and the head would be firmly locked together, but thatportion of the top of the head above the flange 7 would be cylindricalas hereinafter described and illustrated in Fig. 5. I, therefore, do notwish to limit my invention to a rivet having a shank with a conical topfitting in a conical hole in the head, the important part of theinvention residing in the flange 7 upon the head projecting into theannular groove 13 in the shank between the shoulder 11 and the annularflange 12. In some cases the head 5 might be very large in proportion tothe shank of the rivet and where used for ornamental purposes thediameter of the head portion 9 of the shank might be as large or evenlarger than the diameter of the portion 10 thereof, in which case saidportion 10 would be cylindrical instead of conical, ashereinbeforedescribed.

In the modified form of my invention hereinbefore referred to andillustrated in Fig. 5, 5 is the head of the rivet having therein a hole,6 at the bottom of which is an annular flange 7 The shank 8 consists ofa top 9 and a stem 10 The top 9 fits in the hole 6 in the head 5 andsaid top or head of the shank portion of the rivet terminates at itslover end in a shoulder 11 which rests upon the upper side of the flange7 flange 12 thereon which is located immediately beneath and in contactwith the annular flange 7 on the head 5 whereby an annular groove 13 isprovided between the shoulder 11 and, the flange 12 into which groovethe annular flange 7 upon the head 5 projects. It will be seen that inthis form of my invention as in the form illustrated in Figs. 1 to ainclusive the head 5 is held firmly upon the shank until the head 9 ofthe shank has worn down to the shoulder 11 Having thus described myinvention, what 7 I claim and desire by Letters Patent to secure is:

1. A twopart rivet consisting of a head and a shank, said shank havingat one end a conical top terminating at its lower end in a shoulder andan annular flange thereon The stem 10 has an annular located beneathsaid shoulder, whereby an annular groove 1s formed between said shoulderand flange, said head having a conical hole therein with an annularflange at the x bottom thereof, the conical top of said shank fitting insaid conical hole and the annular flange on said head fitting in saidannular groove.

2. A and a shank, said shank consisting of a stem with a conical head atone end thereof terminating at its lower end in a shoulder and 7 anannular flange on said stem beneath said shoulder, whereby an annulargroove is formed between said shoulder and flange, said head having aconical hole therein,

two'part rivet comprising a head with an annular flange at the bottomthere- 3. A two-part rivet consisting of a head and a shank, said shankhavmg at one end a top terminating at its lower end in a shoulder and anannular flange thereon located beneath said shoulder, whereby an annulargroove is formed between said shoulder and flange, said head having ahole therein with an annular flange at the bottom thereof, said top ofsaid shank fitting in said hole and said annular flange on said headfitting in said annular groove.

In testimony whereof I have hereunto set my hand in presence'of twosubscribing witnesses.

lVILLlAM P. BARTEL.

\Vitnesses .CrrARLrs S. GoonING, LOUIS A. J ONES.

